From cb9ea47e7825b5073d4d645afb94f6326cb7cf4d Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sun, 6 Sep 2009 12:52:53 +0200
Subject: Start the libcutl repository

---
 cutl/static-ptr.hxx | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 cutl/static-ptr.hxx

(limited to 'cutl/static-ptr.hxx')

diff --git a/cutl/static-ptr.hxx b/cutl/static-ptr.hxx
new file mode 100644
index 0000000..12ecc1c
--- /dev/null
+++ b/cutl/static-ptr.hxx
@@ -0,0 +1,75 @@
+// file      : cutl/static-ptr.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef CUTL_STATIC_PTR_HXX
+#define CUTL_STATIC_PTR_HXX
+
+#include <cstddef> // std::size_t
+
+namespace cutl
+{
+  // This class template implements Jerry Schwarz's static
+  // initialization technique commonly found in iostream
+  // implementations.
+  //
+  // The second template argument is used to make sure the
+  // instantiation of static_ptr is unique.
+  //
+  template <typename X, typename ID>
+  class static_ptr
+  {
+  public:
+    static_ptr ()
+    {
+      if (count_ == 0)
+        x_ = new X;
+
+      ++count_;
+    }
+
+    ~static_ptr ()
+    {
+      if (--count_ == 0)
+        delete x_;
+    }
+
+  private:
+    static_ptr (static_ptr const&);
+
+    static_ptr&
+    operator= (static_ptr const&);
+
+  public:
+    X*
+    operator-> () const
+    {
+      return x_;
+    }
+
+    X&
+    operator* () const
+    {
+      return *x_;
+    }
+
+    X*
+    get () const
+    {
+      return x_;
+    }
+
+  private:
+    static X* x_;
+    static std::size_t count_;
+  };
+
+  template <typename X, typename ID>
+  X* static_ptr<X, ID>::x_ = 0;
+
+  template <typename X, typename ID>
+  std::size_t static_ptr<X, ID>::count_ = 0;
+}
+
+#endif // CUTL_STATIC_PTR_HXX
-- 
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